KR100189284B1 - Method and device of sled screw and its sled screw - Google Patents

Abstract

The present invention relates to a method of manufacturing a sled screw for guiding a reader for reading a record for an audio device and an imaging device in an electronic product, and a sled screw made of a rolling die and a rolling die for manufacturing a sled screw. In more detail, a metal wire is used as a material, and a header is processed to obtain a primary workpiece by first machining one end of the material to match the outer diameter of the sled screw, and a rolling process of the primary workpiece to a large diameter part. And a rolling process for cutting and simultaneously curved each end of the small diameter portion, and obtaining a semi-finished product with ring grooves on the large diameter portion and the small diameter portion, and a screw rolling process for forming a pre-screw in the body of the semi-finished product by screw rolling the semi-finished product. The grinding process of grinding the preliminary screw into a finished screw, and cutting the opposing part with a diameter slightly larger than that of the small diameter part. It is an object of the present invention to provide a method of manufacturing sled screws in a cutting process, and a rolling die for producing a semi-finished product for producing the sled screw by simultaneously cutting both ends of the primary workpiece and cutting the surface. It is to provide a sled screw manufactured with several to several tens of times of productivity than manufacturing.

Description

Manufacturing method of sled screw and rolling die for manufacturing sled screw and sled screw made of rolling die

(A)-(f) is a manufacturing process diagram of the sled screw which shows the process of manufacturing the sled screw of this invention.

Figure 2 (a) (b) is an enlarged cross-sectional view of the sled screw manufactured by the present invention and a partial extract of the screw acid.

Figure 3 is a front view showing an embodiment of a rolling dice for producing a sled screw of the present invention.

(A), (b), (c) of FIG. 4 are cross-sectional views taken along line A-A, B-B, and C-C of FIG. 3, showing a process of manufacturing a sled screw with a rolling die of the present invention.

5 is a front view showing another embodiment of a rolling dice of the present invention.

(A) (b) of FIG. 6 is a partially expanded sectional view which shows the Example of the upper and lower cutting blades of the rolling dice of this invention.

7 is another embodiment of a sled screw manufactured by the present invention.

8 is a view showing a configuration of a conventional sled screw.

* Explanation of symbols for main parts of the drawings

1: Material 2: Primary Workpiece

3: tofu 4: large neck

5: semi-finished product 6a, 6b: curved surface

7: opposite side 8a, 8b: ring groove

9: annular dolthe 10: small diameter part

11: screw processed product 12: finished screw

13 grinding work product 14 sled screw

15: rolling dice 16a, 17a: first half

16b, 17b: latter part 18a: introduction part

18b: discharge section 19, 20: curved surface processing area

21, 23: ring groove forming projection 22: guide surface

24: small diameter molding protrusion 25: annular dolte forming groove

26a, 26b: fine iron parts 27, 28: to guide

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a sled screw for guiding a reader for reading a record in audio and video electronics, and to a rolling die for manufacturing a sled screw and a sled screw made of a rolling die. .

More specifically, the wire rod having a slightly smaller outer diameter than the outer diameter of the sled screw to be made is a pin shaft material, which is first processed with a heading machine, and then a rolling die is used to make a semi-finished product of the sled screw. The purpose is to produce a more precise sled screw by forming and grinding the semi-finished product as a screw rolling die, and to provide a rolling die that can process the semi-finished product of the sled screw. The other purpose is to enable the mass production of sled screws to contribute to industrial development.

In general, a reader for reading a record in an audio device or a video device is installed on a small pin shaft. In particular, in the case of a reader of an audio device or a video device installed on a moving object such as a car, there is a small method for reliably preventing vibration. The pin shaft uses screwed sled screws (also called lead screws) to allow the reader to move without vibration.

As described above, the conventional sled screw used to move the reader precisely without vibration has been manufactured by a cutting process using an automatic lathe, so that the productivity is not good and the manufacturing cost is high. There was this.

That is, this type of sled screw has a flat outer end and has a curved or inclined surface, for which reason one end of the sled screw is rotatably inserted into the bearing part (not shown) and the other end of the motor Both ends of the sled screw should have a flat outer diameter without the configuration of the screw because it is connected to the joint (not shown) condensed to the output shaft, for this purpose, conventionally, using a pin rod material, In the manufacture of 100, each end of both ends 101 and 102 was cut by an automatic lathe to process the curved surfaces 101a and 102a, and the cutting process of the screw 103 formed between both ends. For the sake of convenience, one end 101 connected to the joint on the motor side is made smaller in diameter so as to have the same diameter as the diameter of the recess 103a of the screw 103. The end 102 is configured to have a large diameter to have the same diameter as the convex portion 103b of the screw, and the recess 103a ends at the other end 102 side having the same diameter as the convex portion 103b of the screw 103. As the diameter gradually increased, eventually it was configured to meet the outer diameter of the other end 102, which was possible by a cutting method using a lathe.

However, since the conventional sled screw 100 as described above should be manufactured using an automatic lathe, there is a problem that its productivity is low and the processing cost is high.

The present invention has been invented for the purpose of providing a manufacturing method to enable high-volume mass production with high precision using a sled screw product manufactured by an automatic lathe as in the prior art. Another object is to provide a rolling die that can be produced by a rolling processing method, and another object is to provide a cheap sled screw product manufactured by the rolling processing method. An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a process drawing showing a process for manufacturing a sled screw according to the present invention, in which (a) is a cut of a metal wire (stainless steel wire) to a certain length to obtain a raw material (1), and then the raw material (1) In the header process by a heading machine, one end is processed to obtain a primary workpiece (2) as shown in (b), and the processing process until the material (1) and the primary workpiece (2) is obtained is headed. It consists of the continuous processing process which cuts a rolled metal wire continuously by a machine and processes a header.

The diameter of the material 1 is preferably a manufacturing method having a diameter slightly smaller than the diameter of the sled screw 14 of the finished product required by the present invention.

The primary workpiece (2) obtained in the header process is to be processed so that the head (3) and the large diameter portion (4) are formed at the end of the processing, wherein the outer diameter of the large diameter portion (4) is the outer diameter of the sled screw (14) as a finished product To match with.

The primary workpiece (2) is transferred to a rolling process and rolled. In this rolling process, the primary workpiece (2) is continuously supplied to the rolling die using a vibrator or the like to provide a rolling process (rolling die for rolling). The composition and rolling process will be described later) to obtain a semifinished product 5 as shown in (c), wherein the semifinished product 5 is cut and removed tofu 3 formed at the time of the primary processed product 2. The outer surface of the large-diameter portion 4 is processed into a curved surface 6a or an inclined surface along with a surface finish having precise roughness, and the end of the opposite portion 7 of the large-diameter portion 4 is also processed into a curved surface 6b. do. And to form a ring groove (8a) on the side of the large diameter portion 4, and to form a ring groove (8b) and the small diameter portion (10) on both sides of the annular doltte (9) on the opposite side (7), the annular The outer diameter of the dolthe 9 is to be processed to be the same as the outer diameter of the large diameter portion 4, the outer diameter of the ring groove (8a) and (8b) is the screw 12 of the sled screw 14 of the finished product required by the present invention It is preferable to have a dimension smaller than or equal to the recessed part (a), and the outer diameter of the small diameter portion 10 is pre-machined to hold the dimensions required for the sled screw 14 of the finished product.

The semi-finished product (5) as shown in (c) in the rolling process as described above is screwed into the body of the semi-finished product (5), that is, the body between the ring groove (8a) and (8b) in the screw rolling process using a conventional screw rolling die In this case, the screw formed in the body is processed into a preliminary screw 12a that is much larger than the outer diameter at the time of the semifinished product 5, and such a preliminary screw 12a is pushed out of the recess (a) during screw rolling processing. It is naturally formed by the phenomenon (see also (d)).

Particularly, the ring grooves 8a and 8b formed on both sides of the body of the semi-finished product 5, which have undergone the rolling process, have an outer diameter equal to or smaller than that of the recessed portion a of the preliminary screw 12a formed by screw rolling. The neck and the small diameter portion 10 side is never bent or broken phenomenon, the body having a pre-screw 12a, the large diameter portion 4 and the small diameter portion 10 is a screw that has the correct straightness The finished product 11 can be obtained.

The screw processing semi-finished product 11 which has undergone the screw rolling process is put into the grinding process and the preliminary screw 12a having an outer diameter larger than the outer diameter of the large diameter portion 4 is ground, and as shown in (e), the large diameter portion (7) which is to be machined into a grinding finished product (13) ground with a finished screw (12) having the same outer diameter as (4), followed by an opposing portion (7) with an outer diameter slightly larger than the small diameter portion (10) in the cutting process. Is to manufacture the sled screw 14 of the finished product as shown in (f), the cutting process is to remove the opposite portion 7 by cutting the reference to the outer diameter of the small diameter portion (10). will be.

The sled screw 14 of the present invention manufactured as described above has the outer diameter and the curved surface of the size required for the large diameter portion 4 and the small diameter portion 10 as shown in the enlarged view shown in FIG. The screws 12 themselves also have better precision than those cut into lathes.

Header processing, rolling processing, screw rolling processing, and grinding processing of the above machining processes are excellent in the workability and the cutting processing is performed by cutting only the opposite portion 7 on the small diameter portion 10 side, which is a very short portion. This also has the advantage that the processing time can be very short, there is an effect that brings the productivity of several times to several tens of times compared to the production of sled screw products using a conventional automatic lathe.

As described above, the header processing, the screw rolling processing, and the grinding processing of the machining process according to the method of manufacturing the sled screw by the rolling processing method can be performed by using the existing machinery and processing methods as appropriate. The rolling die used in the rolling process for converting the processed primary processed product (5) into a semi-finished product (5) is different from the existing rolling die in which both ends are cut and curved (or inclined) at both ends of the workpiece. There is a feature that allows simultaneous cutting and simultaneous surface treatment, and this feature is occupied the largest proportion in the sled screw can be manufactured by the rolling processing method.

Therefore, the characteristic structure of the rolling die 15 which produces the semi-finished product by the rolling process and the process of forming the semi-finished product using the same will be described as the embodiment shown in FIG. 3 and FIG.

3 is a front view showing a machined portion of the rolling die 15 of the present invention, and cutting edges 16 and 17 cutting the large diameter portion 4 and the opposite side of the primary workpiece 2 at the top and bottom of the machined portion. It is formed in a symmetrical state on the upper side, the upper and lower cutting blades (16) and (17) are the first half (16a) protruding inclined shape and the second half (16b) formed horizontally inward of the first half, It is divided into (17b).

The first half 16a, 17a of the upper and lower cutting edges are formed in the shape of a triangular protrusion, and the introduction ends of the first half 16a, 17a gradually increase from a point coinciding with the machining surface of the introduction portion 18a. It protrudes obliquely to the point which meets the latter half part 16b, 17b, and the upper surface of the latter part becomes a state which protrudes so that a plane may be formed. In addition, curved surface processing areas 19 and 20 forming a curved surface are formed inside the first half portions 16a, 17a, and the second half portions 16b, 17b.

A guide surface 22 for guiding the large-diameter portion 4 of the primary workpiece 2 is formed between the ring groove forming protrusion 21 formed at the lower half of the upper cutting blade 16 and the ring groove forming protrusion 21. The first half 21a of the) forms an inclined surface which gradually increases from the introduction end, and the width of the upper surface thereof is also gradually expanded, and the rear end 21b protrudes into a plane having a constant width. In addition, above the lower cutting edge 17, the ring groove forming protrusion 23 and the small diameter forming protrusion 24 are respectively protruded, and these ring groove forming protrusions and the small diameter forming protrusions are also composed of the first half and the second half, and the first half and the second half. Is configured in the same shape as the ring groove forming protrusion 21 described above. In addition, the annular dolthe forming groove 25 formed between the ring groove forming protrusion 23 and the small diameter forming protrusion 24 is composed of a groove 25a forming a V-shape at the introduction end side and an annular end at the discharge end side. It is formed to form the dolthe (9).

In the above, the upper and lower ring groove forming protrusions 21 and 23 and the small diameter forming protrusions 24 are respectively gradually increased, and the width is gradually composed of the first half and the second half formed with a constant width. In order to be able to be processed into the shape of the ring groove (8a) and (8b) and the small-diameter portion 10 of the complete shape from the first half to the second half gradually when rolling.

In addition, two lines of uneven portions 26a and 26b are formed on the working surface of the rolling die 15 so that the primary workpiece 2 can be rolled without slipping, and a lower horizontal surface is provided under the lower cutting blade. The guide path 27 which has is formed.

The rolling process of the primary workpiece 2 using the rolling die 15 as described above will be described as an example of FIG. 4. One is to be fixed and the other is to be installed and rolled. When the primary workpiece (2) is supplied to the inlet of the stationary rolling die, the rolling die in the operating state is operated to operate the primary workpiece (2). At this time, the upper and lower cutting blades 16 and 17 protruding from the processing surface at the moment when the primary workpiece 2 is introduced into the introduction portion 18a of the rolling die 15 as shown in FIG. 4 (a). Since the first half portions 16a, 17a and the first half portions of the ring groove forming protrusions 21, 23 and the small diameter forming protrusions 24 coincide with the machined surface, the primary workpiece 2 itself is the head (3). ), The large diameter portion 4 is not in the state where the upper portion of the rolling die 15 protrudes. With the groove 22, the body is introduced into the machining surface, and the primary workpiece 2 moved to the machining surface in accordance with the movement of the rolling die operated in such a state is cut up and down as shown in FIG. 4 (b). The large diameter portion of the primary workpiece 2 is formed by the first half portions 16a and 17a of the blades 16 and 17 and the first half portions of the upper and lower ring groove forming protrusions 21 and 23 and the small diameter forming protrusions 24. (4) The upper and lower portions of the upper body and the lower body are compressed to reach the second half where they meet the first half, so that the large diameter portion 4 is cut, and the upper and lower portions of the body have ring grooves 8a and 8b of the required shape. And the small diameter portion 10 are formed, the ring grooves 8a and 8b and the small diameter portion 10 and the annular dolthe 9 are formed to reach the discharge portion 18b as shown in (c) of FIG. It is processed into semifinished product 5 of complete shape.

In the above, the head 3 is cut and removed by the curved processing zones 19 and 20 formed inside the front and rear half portions 16a, 16b and 17a and 17b of the upper and lower cutting blades. (6b) is formed.

On the other hand, the second half of the upper and lower cutting edges of the rolling die 15 of the stationary side and the movable side are in contact with each other during the rolling processing operation, and the second half formed on the stationary side and the moving side is centerline of the primary workpiece 2. By forming the abutment to the one side eccentric in (P) it is possible to prevent the occurrence of burrs on the curved surface (6a) (6b) of the large diameter portion 4 and the small diameter portion (10).

In addition, the above-described rolling die 15 is an embodiment for rolling the primary workpiece (2) with the head, the upper cutting edge is formed on the top of the rolling die 15, but as shown in the embodiment of FIG. The embodiment in which the guiding path 28 is formed upward, in the case of such an embodiment, is to allow rolling processing of the absence of the head 3 in the primary workpiece 2, and cutting and curved processing at both ends of the primary workpiece. And the action and effect for forming the ring groove and the small diameter portion in the upper, lower portion is the same as in the above embodiment.

(A) and (b) of FIG. 6 are the structures of the first half 16a, 17a and the second half 16b, 17b of the upper and lower cutting edges 16, 17 of the rolling die 15 for producing a semi-finished product. It shows the state in detail.

7 is a view showing another embodiment of the sled screw, in which the sled screw 14 also uses a rolling die 15 to form a semifinished product 5 and then a screw rolling die for widening the pitch of the screw. Since the screw is formed using (not shown), the manufacturing method of the sled screw of this kind manufactured by rolling processing regardless of the narrow or wide pitch and the rolling die and semi-finished product for producing the semi-finished product All sledscrews fall within the scope of the present invention.

According to the present invention of the member member, it is possible to manufacture a sled screw by selecting a little smaller than the outer diameter of the sled screw to manufacture the diameter of the material, thereby reducing the cost of the material. The large diameter part, which should match the outer diameter of the sled screw without cutting, is formed to be swelled by the header processing, and the screw part is a means of rubbing the screw rolling die, so that it is possible to push the recessed part of the pressed part to the iron side to make up the screw. After the screw part is made larger than the required diameter, the cutting part can be precisely cut to the precise dimension to manufacture the sled screw. In this way, the header, rolling and cutting processes have a high cutting speed. Very fast, compared to the manufacture of sled screws with conventional automatic lathes. To be effective as can be expected that the productivity over several orders of magnitude, but will have to give a uniform high accuracy effect on the sled screw is produced, one of the characteristics of the rolling process in bulk.

Claims (3)

(Correction) a header step of forming one end of the material 1 cut to a predetermined length by forming a large diameter portion 4 by header processing; Rolling processing of the primary workpiece (2) through the header process to form upper and lower ring grooves (8a) (8b) and the small diameter portion (10) and at the same time the large diameter portion 4 and the small diameter portion (10) A rolling step of cutting the end of the portion 7 and producing the semifinished product 5 having the curved surfaces 6a and 6b formed thereon; A screw rolling process of screw milling the semi-finished product (5) made in the rolling process to obtain a screw processing semi-finished product (11) in which a pre-screw (12a) is formed in a body between upper and lower ring grooves (8a) and (8b); A grinding process of grinding the preliminary screw 12a of the screw milling product 11, which has undergone the screw rolling process, to produce a milling milling product 13 on which a finished screw 12 is formed; And a cutting step of cutting and removing the opposite portion 7 having the outer diameter slightly larger than the small diameter portion of the grinding-processing finished product 13 that has been subjected to the grinding process to the same outer diameter as the small diameter portion 10. Method for producing a sled screw, characterized in that the manufacturing. (Correct) The ring groove forming protrusion 21 and the small diameter portion forming protrusion 24 protrude from the machining surface of the rolling die 15, and the first half 16a and the second half 16b at the upper and lower sides of the machining surface. The semi-finished product is formed by rolling the semi-finished product 5, which is divided into (17b) and is formed by symmetrically forming upper and lower cutting edges 16 and 17, each of which has curved surfaces 19 and 20 therein. Rolling dice for producing a sled screw, characterized in that both ends of the cutting and simultaneous surface processing. (Correction) In a sled screw formed by forming a completion screw between a large diameter portion and a small diameter portion, between the ends of the completion screw 12 and each of the large diameter portion 4 and the small diameter portion 10 of the finished screw. Ring groove (8a) (8b) formed of an outer diameter smaller than the outer diameter (a) and the annular dolte (9) formed between the small diameter portion 10 and the ring groove (8b) is made of a rolling die Sled screw.